14.22 Textbook of Engineering Drawing __ ---' ___ _
- 2 points
- 2 tangents and a point
- 3 tangents
14.10.4 Drawing Ellipses and Elliptical Arcs, 14.
Ellipses are much easier to draw with CADD than on a drawing board. On a drawing board, you
need to find the right size template or draw a series of arcs individually to draw an ellipse. With
CADD, all you need to do is specify the size of the ellipse.
The following are two basic methods for drawing ellipses:- Length and width
- Axis and rotation angle
Note: The above topics are illustrated with Figs. in CADD PRIMER.
Adding Text to Drawings
CADD allows you to add fine lettering to your drawings. You can use text to \ rite notes.
specifications and to describe the components of a drawing. Text created with CADD is neat,
stylish and can be easily edited. Typing skills are helpful if you intend to write a lot of text.
Writing text with CADD is as simple as typing it on the keyboard. You can locate it anywhere
on the drawing, write it as big or as small as you like and choose from "-number of available fonts.Note:
The drawing tools
3-5
When large amounts of text are added to drawings, it slows down the screen displays. Many
programs provide options to temporarily tum off text or to display text outlines only. This feature
helps save computer memory and speeds up the display of screen images. The text can be turned
back on whenever needed.
The following are the basic factors that control the appearance of text:
(The exact terms and procedures used vary from one program to another.)- Text height
- Height to width ratio and inclination ofle~ers
- Special effects
- Alignment of text Gustification)
- Text fonts
Note: The above topics are illustrated with Figs. in CADD PRIMER.